Mercedes-Benz C-Class Saloon Owner's Manual page 512

510 Display messages and warning/indicator lamps
Warning/indicator lamp Possible causes/consequences and
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The red brake system warning lamp is lit while the engine is running.
Possible causes:
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Brake system warning lamp
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(red)
& WARNING There is a risk of an accident if brake force boosting is malfunctioning
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. Braking char‐
acteristics may be impaired. The braking distance may increase in an emergency braking situation.
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& WARNING Risk of an accident due to low brake fluid level
If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.
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The brake force boosting is malfunctioning and the braking characteristics may be affected.
There is insufficient brake fluid in the brake fluid reservoir.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do
not continue driving under any circumstances.
Consult a qualified specialist workshop.
Stop the vehicle as soon as possible, paying attention to road and traffic conditions. Do not continue driving.
Consult a qualified specialist workshop.
Do not top up the brake fluid.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not
continue driving under any circumstances.
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